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@article{DAN_1975_223_1_a16, author = {A. S. Uskov}, title = {Method of extremal characteristics}, journal = {Doklady Akademii Nauk}, pages = {68--71}, publisher = {mathdoc}, volume = {223}, number = {1}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1975_223_1_a16/} }
A. S. Uskov. Method of extremal characteristics. Doklady Akademii Nauk, Tome 223 (1975) no. 1, pp. 68-71. http://geodesic.mathdoc.fr/item/DAN_1975_223_1_a16/